Below is a fun video tutorial that quickly teaches you how to use the floor 'shape editing' tools to create the sloping slabs of a multi-level Parking Garage or 'Parkade'.
Create the flat floor, add some points, change the elevations then copy and paste the floor up to the other 3 levels.
Video TIP: 1. Click the Play button. 2. Then click the 'HD' button, 3. THEN click the 'Full Screen' button . . . . Youtube is still working on this feature.